How to create dynamic grids in After Effects

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Expression to Center between guides:

For x position:

null1X = thisComp.layer("NULL X1").transform.xPosition;
null2X = thisComp.layer("NULL X2").transform.xPosition;

(null1X + null2X) / 2;

For Y position:

null1Y = thisComp.layer("NULL Y1").transform.yPosition;
null2Y = thisComp.layer("NULL Y2").transform.yPosition;

(null1Y + null2Y) / 2;

Expression for Power Pin effect:

var x = thisComp.layer("NULL X1").transform.xPosition;
var y = thisComp.layer("NULL Y1").transform.yPosition;
[x, y]